) find p-value b) P(Z > z ) for a = .05 for a = .025 4) Reject Ho if p-value is less than The data must be a SRS from the population Pshyc 101 class as SRS for vision Soc 101 class as SRS to test attitudes towards the poor Different methods are needed for different designs SRS from Normal data, Shape of the population distribution and sample distribution Margin of error doesn"t cover all errors How small a P is convincing?